Tiny, low-power in amp

2 September 2009 Analogue, Mixed Signal, LSI

Analog Devices has introduced what it claims is the industry’s smallest and lowest power instrumentation amplifier (in amp).

Smaller than the tip of a pencil, the miniscule size of the AD8235 makes it effective for power-efficient and portable, lightweight medical devices and consumer-health products, including home-use ECG (electrocardiogram) monitors, infusion pumps and activity-monitoring medical devices.

The device measures 1,6 x 2,0 mm and operates from 1,8 V and 5,5 V power supplies while drawing only 40 μA, making it suitable for other low-power applications, including consumer fitness products and industrial pressure and low-side current-sensing measurement equipment. These applications also benefit from the in amp’s 6 nA shutdown current and 40 pA bias current.

The AD8235’s wide common-mode input-voltage range (4 V and 1,4 V on 5 V and 1,8 V supplies respectively) is important for the low-voltage operation required by many battery-powered portable applications. A high common-mode rejection ratio (CMRR) of 86 dB (at a gain of 5) effectively eliminates common-mode interference.

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